Rotary mining-drill.



G. e. BARKER. ROTARY MINING DRILL. APPLICATION IIIED JULY 2,1909.

' Papgnted Aug. 2, 1910.v

2 sHBETs -SHEET 1.

[NVEN TOR Af/omey G. G. BARKER.

ROTARY MINING DRILL.

APPLICATION FILBDJULY 2,1909

966,377, Patented Aug. 2, 1910.

2 SHEETS-SEEM a.

N [NVENTOR 6 0g? GBarfen y I I I Afform'y earth sans parent oration.

GEORGE G. BARKER, OF UPLAND, PENNSYLVANIA, ASSIGNCPR F ONE-HALF TO WILLIAM G. ALEXANDER, 01? MEDIA, PENNSYLVANIA.

ROTARY MINING-DRILL.

Specification of Letters Patent.

Patented Aug. 2, 1910.

Application filed July 2. 1909. Serial No. 505,737.

To all whom it may concern.-

Be it known that I, Gnonoa G. Barman, a citizen of the United States, residing at Up land, in the county of Delaware and Flare of Pennsylvania, have invented certain new and useful Improvement in Rotary Mining- Drills, of which the following is a specification.

The present invention relates more particularlv to mechanism for mining coal, and .especially tothc cutting means.

lf ifgure l is a side elevation of a drilling machine having the novel cutter thereon. Fig. is a plan view (it the cutting" head. Figs. and l are cross sectional views at right angles to said cutting: head. Figs. and it are details in {)(l'r-IPCCllVC respectively of the straight and diagonal teeth.

Hll'l'llltll' ret'ercnce nun'icrals designate cor- .res nindiog parts in all the figures of the drawil'igs.

la the embodiment disclosed, the mining machine briefly described, consists of a body 6 mounted on front supporting wheels '7 and a rear driving wheel 81 T his body con tains a motor of suitable character, which includes a shaft projecting from its oppositc ends. The rear end of the shaft carries a we til it meshing will a worm wheel it that fast to the rear driving wheel axle, so that. the forward movement or feed of the machine etl'ected upon the rotation of the motor. Secured to the other end of the shaft 9 is a stub 12 carrying a coupling 11-), in which detachably titled a cutter stem or shaft ll journalcd in a suitable projectbracket 15. This stem or shaftll has titted upon its free end a head 16, said head being provided with a socket 17 to receive the end of the shaft and being pinned thereto, as shown at 18 or otherwise suitably fastened. The head it) carriesradial arms 19 provided with sockets 20, and secured to said arms are rows of teeth 21 and 22. These teeth have stems 23 that pass through the sockets with nuts 24 threaded upon their rear ends. The teeth taper outwardly to points, and also taper rearwardly to provide clearance. The teeth 21 have their 0ppositeside faces correspondingly beveled, so that the longitudinal axes'ot these teeth are disposed parallel to the axis of rotation of the head. These teeth are slightly spaced apart, as shown. The other teeth 22 are disposed at an inclination, and operate diagonally in the spaces between the paths of movement of the teeth 21. It will be ob served particularlyby reference to Fig. 4 that theinclined teeth are carried by the two opposite arms, and that they all are inclined in the same direction so that. their paths of movement are set at opposite inclinations. In other words, the teeth of one arm incline toward the axis of rotation of the tool head, while those of the other arm incline away from such axis. The head 16 is provided in its front end with a threaded socket into which is screwed the stem 26 of a centering cutter 27' that tapers to a oint and projects beyond the free ends 0 the cutting teeth. This centeringe tter has its (lll'ltrl'tlflt faces inset to provide a plurality of radial beveled cutting edges 28.

it will be clear that this structure is ex-' (reedinol v simple, and the parts are such that a thorough and rapid cutting action is so; cured, the inclined teeth cutting away the portions left by the straight teeth. Moreover with this device. whenever any tooth becomes dull or injured, it may be removed and rcsharpened or replaced by a new one without. dismcmbering the entire structure.

From the foregoing, it is thought that the construction. operation and many advantages ot the herein described invention w1ll.

be apparent to those skilled in the art with out further description, and it will be un-. (ltt'SiOQd that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing" from the spirit or sacrificing any of the advantages ot the invention.

Having thus fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1.--lna in ining drill, the COIlllltHtllClOIl with a rotary support, of radial rows of teeth carried thereby, the teeth of one row having convergent opposite faces and longitudinal their longitudinal axes disposed substanaxes that are disposed longitudinally of the v)tiallyparallel to the axis of rotation of the axis of rotation of the head, the teeth of 1:;

support, the teeth of another row being set other rows being set at an inclination and; 5' at an inclination to said axis. operating in the spaces between the paths 2. In a mining drill, the combination With of movement of the first mentioned rows. a rotary support comprising a head having In testimony whereof I hereunto afiix my radial arms, said arms having sockets theresignature in the presence of two Witnesses. 2 through, of rows of spaced teeth carried by GEORGE G. BARKER. 10 the arms, said teeth having stems extend- Witnesses:

ing through and fastened in the sockets, the S. W. FInLns, teeth of certain of the-rows having equally ALBERT E. HOLL. 

